The Premium Neoprene Dumbbells are made in a small, compact design from cast iron that is encased in thick, textured neoprene. The neoprene coating makes it easy to hold on to and it forms a protective barrier that prevents the dumbbells from chipping while also preventing damage to your floors. Neoprene is also more durable and less prone to splitting than vinyl, making it a more desirable choice for long-term use. Each dumbbell has the weight printed on the end so it can be identified while still in the storage rack. Great for group classes. Kits and racks also available.